2010 UNCO Math Contest II Problems/Problem 7
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Problem
and 
are each 
-digit 
numbers (like 
and 
), and all four digits are different.
The sum 
is a -digit number made up of two more different digits ( is not necessarily prime).
Further, the difference 
consists of yet two more different digits (again, is not
necessarily prime). The number 
is a two digit number which uses the remaining two digits.
What is ?
